Agent Peacock is an agent with the Hercules Project.
She was born Donna O'Connor but for the purposes of her employment with Hercules, O'Connor might as well have not existed. When the Director of the Project pulled her out of her application meeting to join the CIA, he knew she had what he was needing for an agent with his organization and usurped her from the Agency. He would explain to her that Hercules worked for the same people the CIA did but were separate entities. From the moment the interview began, she was Applicant Twelve and from the time she accepted and was accepted by Hercules, she was codenamed Peacock.
O'Connor/Twelve/Peacock was interesting to Hercules because of her lack of emotions. It was not that she was a psychopath. It was that eight years before, her family was in a horrific car accident that killed all but her and she watched as the vehicle she was thrown from burned. From that moment she was unable to feel emotions, good or bad. Love was alien. Affection nonexistent, at least as it pertained to humans. But, and this was very important to Hercules, she had learned to fake it. This meant that most people around her might think her shy and introverted instead of simply unfeeling. She could maintain that pose for some time and then, when the need to act and even to kill came, she instantly switched it off and killed without hesitation, concern, or remorse, just the belief that she was doing what she was ordered to do.
So a well-trained agent with no compassion for possible victims, no family life to conflict with her duty, and a desire to be of some use to someone made Peacock a very valuable agent.
"Agent Peacock doesn’t argue. She disables people."